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actual atomic mass: 4.002602
The most common isotope of Helium is He-4, which is produced by alpha decay of heavier radioactive elements. As its isotope notation says, it has four neutrons. Because its electrons completely fill the s-orbital, He-4 has an unusally stable nucleus.
www.chemicalelements.com/elements/he.html
http://en.wikipedia.org/wiki/Isotopes_of_helium
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The most common isotope of Helium is He-4, which is produced by alpha decay of heavier radioactive elements. As its isotope notation says, it has four neutrons. Because its electrons completely fill the s-orbital, He-4 has an unusally stable nucleus. www.chemicalelements.com/elements/he.html
http://en.wikipedia.org/wiki/Isotopes_of_helium